Easy example on how to put marker on a d3.js map.
You got 2 options:
- using d3.geo.path() which does all the work for you
- using svg circles and translating them via projection(d.geometry.coordinates)
Last active
December 30, 2023 04:16
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d3.js map with markers
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-opacity: .5; | |
| stroke-width: .5px; | |
| } | |
| .land { | |
| fill: #222; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| circle { | |
| fill: yellow; | |
| } | |
| .geopath { | |
| fill: green; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 1200, | |
| height = 720; | |
| var projection = d3.geo.mercator() | |
| .scale(8000) | |
| .precision(.1) | |
| .center([13.320255,52.52831499]) | |
| .translate([width / 2, height / 2]) | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("world-50m.json", function(error, world) { | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(world, world.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| d3.json("stops_berlin.geojson", function(error, data) { | |
| // using d3.geo.path() which does all the work for you | |
| svg.append("path") | |
| .datum(data) | |
| .classed("geopath", true) | |
| .attr("d", path) | |
| // or insert your own custom dots by hand | |
| svg.append("g") | |
| .selectAll("g") | |
| .data(data.features) | |
| .enter() | |
| .append("g") | |
| .attr("transform", function(d) { return "translate(" + projection(d.geometry.coordinates) + ")"; }) | |
| .append("circle") | |
| .attr("r", 1) | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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how would I go about using svg images as icons for my location dot markers?
is there a way to add them to the data directly?
as in:" icon,city,country,region,lat,lng,ccode
" (mysvgimage) ,Aden, Yemen,Middle East,15.552727,48.516388,YE ?
yes that should be doable by replacing the circles with images:
.append("circle")
.attr("r", 1);
to
.append("image")
.attr("width", 10)
.attr("height", 10)
.attr("href", d => d.icon)
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I believe it's because the 'translate' values and the 'scale' values are too high. I cancelled the 'translate' attribute and reduced the scale to 100. If you do this, you can se the graticule